I think people are looking at the 'extra content' the wrong way.
I play AL.... through that I have access to ~30 short adventures every year to play in a public space where I can drop in or out as desired. My PCs can be played at any AL game in various stores or Cons as I see fit. Those same PCs can also play in any of the hardcopy published adventures.
For me, thats a lot, and I am happy playing them and playing in the League.
Now, *in addition* to all that.... if I come across an Admin, or go to certain Cons, there is *extra* content that I may also get to play. *BONUS TIME*
None of this effects my enjoyment of the adventures I already have access to. If I don't go to any cons.... it doesn't matter if this extra content exists or not. I still had fun playing last Wednesday..... Still plan on having fun next Wednesday. Nothing changes that just because some other person, in some other place, gets to play an adventure that I will never play.
I think its cool that there is content making the Cons 'special'.... I like that they get premieres, and one day (when my kids are older) I may get to one to play an Epic. Or maybe not... but whether I do or not, doesn't change the fun I am having in the meantime.